72 CALIFORNIA ACADEMY OF SCIENCES. 



EUipsocephalus hoffi Scliloth. Asaphits extenuatusy^Sihl. Acidaspis verneuill/ 

 Barr., A. leonhardi Barr. Dalmanites socialis Barr. Eye of Bronteun 

 hrongniarti. lUceniis tauricornis, etc. 



Giebel (C.) Die silurische Fauna des Uiiterharzes. 



In Abhandl.Nat. Vereins Sachsen u. Thtiringen, vol. I, 1858, p. 1, 7 pis. 



Harpts hinchofi A. Roem. Proetus jjictus n. sp. Cyphaspis hydrocephala 

 Komer. Phacops angnstic.eps n. sp., P. ? sternbergi n. sp. Dalmanites 

 tiiherculatus u. sp. Lichas sexlobafus Komer. Acidaspis selcana Eomer, 

 A. hercynicn n. sp. Bronteus hishofi n. sjo. 



Goldfuss (A.) Observation sur la '-place qu'occupent 

 les Trilobites dans le regne animal. 



In Auuales Sci. Nat. Paris, vol. 15, 1828, p. 82, pi. 2. 

 A>>a})hus. ('aly7nene. 



Catalogue des Trilobites. 



In Handbnch der Geognosie von de la Beche, 1832. 



This list was copied by Dr. Jacob Green in his "Monograph of the 

 Trilobites of North America," p. 20. 



Beitrage zur Familie der fossilen Crustaceen. 



In Nova Acta Physico Med., vol. 19, 1839, Breslau, p. 353, pi. 33. 



Har})e8 u. g. Arges n. g. Bostrichopus n. g., B. antiquus n. sp. Arges 

 armatns u. sp. Harpes macrocejjhalus n. sp. Brontes flabellifer n. sp. 11- 

 henits 'i triacanthus n. sp. 



Systematische Uebersicht des Trilobiten und 



Beschreibung eniger neuen Arten. 



la Neues Jahrbuch ftir Mineral., 1843, p. 537, pis. 4-6. 

 New genera Anthes, Gerastos and Symphysurus. 



The author classifies 204 species under 31 genera i^rincipally on the 

 characteristics of the eyes as follows : 



I. Without eyes, a — without segments. 1, Agnostiis Brong. b — with 

 segments. (a) segments of the pygidium effaced. 2, Ampyx. 3, Grypto- 

 Uthus. 4, Arges. 5, Olenu.s. (b) segments of the pygidium distinct. 6, 

 Zethus. 7, Otarion. 



II. Eyes smooth or finely reticulated. A — Thorax and pygidium indis- 

 tinctlj' separated, (a) The last segment without appendages. 8, Para- 

 (loxides. 9, AmpMon. 10, Harpes. (b) The last segment with append- 

 ages. 11, Bronteus. 12, EUipsocephalus. 13, Cerauriis. 



B — Pygidium clj'piform, axis and sides not segmented, a — without dorsal 

 gi'ooves. The axis and sides indistinct. 14, Nileus. 15, Bumastus. b — 

 Dorsal grooves faint. Grooves of the sides invisible on the pygidium. 

 10, Dlpleura. c — Dorsal grooves prolonged even to the pj-gidium. 17, 

 Symphysurus. 18, Illceuus. 19, Isotelus. Pygidium clypiform, axis seg- 



